Weekly Builds should be more robust

[Daniel Lewart <lewart3@gmail.com>]

Debian CD [sic] Group,

Weekly builds haven't run successfully recently:
  * Nov  4  Daily Failed
  * Nov 11  Daily Failed
  * Nov 18  Building 10.2

These failures are too common and affect those of us who are trying to
use Testing from USB flash drives.

Could the weekly live cron job be changed to a daily one that builds
things either:
  * Mon
  * Tue-Sun only if there has been no success since Mon

This would greatly improve things when problems arise,
without any manual intervention.

Thank you!
Daniel Lewart
Urbana, IL